Starrett 440 Depth Micrometers have a 63.5mm (2.1/2") base and 3.2mm (1/8") diameter measuring rods.

Starrett 445 Depth Micrometers have a 100mm (4") base and 4mm diameter measuring rods. 

  • Reading surfaces have a satin chrome finish that resists rust.
  • Ring-type lock nut for quick and sure locking.
  • Combination ratchet and speeder for uniform pressure and quicker adjustment.
  • Includes protective case.